| Name | Keuffel & Esser N 4135 S Power Computing Rule |
| Front Scales | A = B CI C = D |
| Back Scales | P = R W = D |
| Type of Rule | |
| Material | Engine divided celluloid laminated mahogany |
| Dimension (mm) | |
| Area of Use | |
| Origin of Rule | Michael O'Leary |
| Match Number | 4425 |
| Comment | |
| Thumbnail | No Picture |